minifix(GUI): fix formatting of ETA

[getsnoopy]

This commit fixes the formatting of the estimated time of arrival to use the proper symbols as per the SI.

[ghost]

An error occurred whilst building your landr site preview:

{
  "name": "JSONHTTPError",
  "status": 429,
  "json": {
    "code": 429,
    "message": "You have reached a limit for sites. Please contact support for further assistance."
  },
  "message": "Too Many Requests",
  "stack": "JSONHTTPError: Too Many Requests\n    at parseResponse (/usr/src/app/node_modules/netlify/src/methods/response.js:13:11)\n    at runMicrotasks (<anonymous>)\n    at processTicksAndRejections (internal/process/task_queues.js:95:5)\n    at async callMethod (/usr/src/app/node_modules/netlify/src/methods/index.js:33:26)\n    at async Object.exports.setupSite (/usr/src/app/lib/netlify.js:69:18)\n    at async Object.exports.run (/usr/src/app/lib/build-runner.js:161:7)\n    at async build (/usr/src/app/bot/index.js:132:19)\n    at async /usr/src/app/bot/index.js:210:25\n    at async Promise.all (index 0)\n    at async middleware (/usr/src/app/node_modules/@octokit/webhooks/dist-node/index.js:355:5)"
}

[Robertschv]

@getsnoopy pull request needs rebase!

[getsnoopy]

@Robertschv Done!